just to help you find it on 307 . this sensor is on a shed load of cars look on ebay for the seller perrys citroen..Proper word is EXHAUST PARTICLE FILTER DIFFERENTIAL PRESSURE SENSOR.IT tells the car that the soot is clogging up in the PFD ie filter next to the cat one.So it burns the soot out at a higher temperature via nasty liquid inside the feul tank which runs out after 120.000 miles.--called a REGENERATION process

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